Tanaka 2010 低频SGR J1550-5418

主要内容:
可一篇观测的文章，我咋就看不懂捏？

精彩摘抄:

图也不知道什么意思，下面那两个图是多么的对称啊，是不是有什么说法？还是本来就应该这样，不该大惊小怪的？

文章信息:

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Title:		First Very Low Frequency detection of short repeated bursts from magnetar SGR J1550-5418
Authors:		Tanaka, Y. T.; Raulin, J. P.; Bertoni, F. C. P.; Fagundes, P. R.; Chau, J.; Schuch, N. J.; Hayakawa, M.; Hobara, Y.; Terasawa, T.; Takahashi, T.
Publication:		eprint arXiv:1008.3609
Publication Date:		08/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Earth and Planetary Astrophysics
Comment:		14 pages, 4 figures, accepted by ApJL
Bibliographic Code:		2010arXiv1008.3609T

Abstract

We report on the first detection of ionospheric disturbances caused by short repeated gamma-ray bursts from the magnetar SGR J1550-5418. Very low frequency (VLF) radio wave data obtained in South America clearly show sudden amplitude and phase changes at the corresponding times of eight SGR bursts. Maximum amplitude and phase changes of the VLF signals appear to be correlated with the gamma-ray fluence. On the other hand, VLF recovery timescales do not show any significant correlation with the fluence, possibly suggesting that the bursts' spectra are not similar to each other. In summary, the Earth's ionosphere can be used as a very large gamma-ray detector and the VLF observations provide us with a new method to monitor high energy astrophysical phenomena without interruption such as Earth Occultation.

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